GTA V
Forgive me for the massive number of screenshots below, but GTA V has a ton of image quality settings.

Here's our first look at performance in a real game, and none of the GPUs show signs of the big spikes and slowdowns we often see. Rockstar has done a nice job with GTA V on that front. As a result, the FPS averages and the 99th-percentile frame times tend to match up pretty closely.

Beyond that, the GTX 950 is pretty clearly faster than the Radeon R7 370 here. Truth be told, both cards are quite competent to run GTA V at these settings.

Those nice, flat frame-time plots above produce equally flat percentile curves. Even the most difficult-to-produce frames don't cause much trouble for most of these cards. Look back a couple of generations, though, and the GeForce GTX 650 is overmatched; it's consistently slow in this scenario.

These "time spent beyond X" graphs are meant to show "badness," those instances where animation may be less than fluid—or at least less than perfect. The 50-ms threshold is the most notable one, since it corresponds to a 20-FPS average. We figure if you're not rendering any faster than 20 FPS, even for a moment, then the user is likely to perceive a slowdown. 33 ms correlates to 30 FPS or a 30Hz refresh rate. Go beyond that with vsync on, and you're into the bad voodoo of quantization slowdowns. 16.7 ms correlates to 60 FPS, that golden mark that we'd like to achieve (or surpass) for each and every frame, and 8.3 ms is a relatively new addition that equates to 120Hz, for those with fast gaming displays.

On our measure of "badness," the GTX 950 and R7 370 are nearly equal. Neither card spends much time working on frames that take longer than 16.7 milliseconds to produce, which means they they both offer an almost flawless and steady 60 frames per second.